Rotary pump



(No Model.)

B. F. SMITH.

ROTARY PUMP.

No. 432,216. Patented July 15, 1890.

VVILflEEEEE- cm.

I VE Lu Z'dwari s m z'tk By I UNITED STATES PATENT QFFICE.

EDWVARD E. SMITH, OF OORRY, PENNSYLVANIA.

ROTARY PU M P.

SPECIFICATION forming part of Letters Patent No. 432,216, dated July 15, 1890.

Application filed November 6, 1889- Serial No. 329,464. (No model.)

To all whom it rmty concern:

Be it known that I, EDWARD F. SMITH, a citizen of the United States, residing at Corry, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Rotary Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invent-ion, such as will enable others skilled in the art to which it appertains to make and use the same, ref-- explained, and illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of my improved rotary pump. Fig. 2 is a transverse section of same on the line 00 0c in Fig. 1. Fig. 3 is an end view of the cylinder and buckets, illustrative of principles governihg their construction.

Like letters refer to like parts in all the figures.

The objects of my invention are, first, to construct a rotary pump having buckets secured to arms extending from the front sides thereof and pivoted to the rotating'head or cylinder in front of said buckets; second, to construct a rotary-pump bucket with arms of such length that when the bucket is at its greatest distance from the center of motion the arms to which it is secured will be substantially at right angles with a radial line drawn through their axes and through the center of the shaft of the rotating head or cylinder; third, to construct a rotary-pump shell with the inlet and outlet substantially near together and substantially at one side of the shell, whereby a rotating head or cylinder having but two buckets pivoted thereto directly opposite each other can be successfully operated therein.

The other features of my invention will appear hereinafter in the specification and claims.

In the construction of my improved rotary pump shown, A is the shell of the pump, having an inlet or suction opening B on one side and an outlet or discharge opening 0 at the top thereof adjacent to the inlet-opening B, and havinga water-space D extending around nearly two-thirds of the circumference of the shell, whereby I am enabled to operate the pump with but two buckets E with a great or greater force and eifect than has heretofore been done with three or more buckets in pumps of this character.

' In bearings F F in the heads G G, secured to the ends of the shell A, I mount the shaft H of a rotating head or cylinder I eccentrically to the inside a of the shell A, so that the head or cylinder I rotates in close proximity to the point of cut-off (Z in the shell A between the inlet B and outlet 0. On opposite sides of the rotating head or cylinder I, I make longitudinal grooves J through the shell of the head or cylinder, opening into longitudinal passages K, extending through the cylinder I, within which groove .I the buckets E op crate radially, these buckets E being sup ported on arms L,'extending from the front sides of the buckets E and pivoted on stud pins or bearings N in recesses M. at the ends of the cylinder I, near the periphery thereof, recesses being also formed in the ends of the cylinder to receive the arms L'when the buckets are closed, so that the arms-L and buckets E are then flush with the periphery and ends of the cylinder I, as illustrated in Fig. 3. Stops m are provided in the central portions of the longitudinal recesses K, with which the inner ends 6 of the buckets E come into contact when the buckets are closed. In constructing the buckets E and their arms L, I make the arms L of such length that when the bucket is opened out against the inside a of the shell A at the point of the greatest distance of the inside a of the shell A from the periphery of the cylinder I the arms L of the bucket E will be at substantially right angles with a line drawn through the centersrof the stud pins or bearings N and the shaft II of the cylinder I. I have illustrated this feature of my invention in dotted lines in Fig. 3, in which I) is a dotted line drawn through the center of the axis of the cylinderI and through the centers of the stud pins or bearingsNN, forming the axes of the arms L L of the buckets E E. c c are also dotted lines, showing sections of the inside a of the shell at the points of the farthest outward movement of the buckets E E, and ff are lines drawn at right angles to the line b from the periphery of the cylinder I to the points 9 g in the dotted lines 0 c, illustrating the extreme outward position of the buckets E E when in contact with the inside a of the shell at its farthest distance from the periphery of the cylinder I, while the parallel lines f f, drawn from the centers of the stud pins or bearings N N through the central portions of the arms L L, show substantially the central draft-line of the buckets E E when constructed as hereinbefore described.

It is obvious from the foregoing that any variation of the radial width of the waterspace Dbetween theperiphery of the cylinder I and the inside a of the shellA would require a corresponding modification of the lengths of the arms L L of the buckets E, this rule of construction being substantially imperative in the construction of this class of pump-buckets for rotary pumps, in order to insure their successful operation and durability. The feature of pivoting the arms L of the buckets to the cylinder I, as hereinbefore described, I have also discovered to be the only method of mounting the bucket-arms upon the cylinder I of a rotary pump so as to insure the minimum amount of friction and wear, this construction being designed as an improvement upon the construction shown and described in my Letters Patent, No. 395,085, dated December 15, 1888, in which construction the bucket-arms are pivoted to the cylinder behind the bucket.

lIaving thus fully described my invention, so as to enable others skilled in the art to which it appertains to construct and use the same, what I claim as new, and desire to secure by Letters Patent of the United States, 1s

1. The combination, in a rotary pump, of a shell having inlet and outlet openings and a cylinder mounted in bearings eccentric to the inside of said shell, having longitudinal grooves therein, with curved buckets mounted upon arms secured to the front sides of the buckets and pivoted to the cylinder ahead of the buckets, so that the buckets swing thereon inward and outward in the grooves in the cylinder, substantially as set forth.

2. The combination, in a swinging bucket adapted to be pivoted to the rotating head or cylinder of a rotary pump, of a longitudinal bucket adapted .to operate in a longitudinal groove or recess in such rotating head or cylinder, with arms secured to the front side of said bucket and pivoted at their front ends to the cylinder, of such length that when the valve is opened to its farthest extent a line drawn from the periphery of the cylinder adjacent to the axes of the arms to the point of contact of the outside of the valve with the inside of the shell of the pump will be substantially at right angles with a radial line drawn from the center of the rotating head or cylinder through the centers of the axes of said arms, substantially as and for the purpose set forth.

The combination, in a rotary pump, of a shell A, having an inlet or suction opening I) and an outlet or discharge opening 0 substantially close together, as shown, arotating head or cylinder I, mounted eccentrieally in said shell, having longitudinal grooves J J and recesses K K therein, and bucket-stopsm m, located in said recesses K K, and buckets E E, mounted on arms L, secured to the front sides thereof and pivoted to the rotating head or cylinder I on stud pins or bearingsNin front of the buckets E E, so that the buckets E E swin radially inwardly and outwardly in the grooves J J and recesses K K in the rotating head or cylinder I, substantially as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

EIHVARD E. SMITH.

\Vitnesses:

A. 1 DOLE, Roi-1T. 0. Home. 

